This research evaluated a dual pathway model for body dissatisfaction among adolescent boys. The study provides empirical support for the importance of distinguishing between weight and muscularity concerns in understanding male body image. A total of 128 boys from grades 8 and 11 completed a self-report questionnaire. Results indicated that weight and muscularity concerns each made unique contributions to body dissatisfaction and were associated with distinct individual and peer context characteristics. Weight concern was associated with elevated BMI and more frequent appearance conversations with friends. Muscularity concern was significantly greater among boys who reported more frequent muscle-building conversations, had lower BMI, and were older. The results support the importance of distinguishing between and assessing both muscularity and weight concerns in the development of body image dissatisfaction among adolescent boys.